Is my neighbors budgie sick or bored?

Well my neighbors want to give me their female budgie. I went to look at her yesterday and over all she looks healthy. Her poop is regular, but its all in one area of the cage. It seems she doesn't move around a lot. They don't play with her and she isn't tamed much. She is in a BIG cage by herself. Is she just lonely and bored? Twice they had bought her company, but both times the birds died with in a week or two of purchased. When they were there she played with them and was happy. They found her outside apparently last june and never took her to the vet. She doesn't have a band so they don't know where she came from. She seems to be some what tamed like she was someones bird but either let go or got free. My guess is someone breed their budgies and never put bands on the babies, then decides to let them go. She is an adult now. Brown cere , iris in her eyes, and no lines to her cere. They don't want her; I am may take her. Thanks to all whom answer! =)